Printing Images on an ESC/POS Thermal Printer in .NET MAUI

When working with POS systems, thermal printers are commonly used for printing receipts, logos, and QR codes. However, printing images on these printers in .NET MAUI can be slightly tricky because most thermal printers only support ESC/POS commands and monochrome images. In this article, I’ll explain the workflow for printing images on an ESC/POS thermal printer using .NET MAUI. The process generally involves four main steps. Load the image Convert the image to monochrome Convert the image to ESC/POS byte format Send the byte array to the printer Step 1: Load the Image First load the image from local storage. public Bitmap LoadBitmap ( string imagePath ) { return new Bitmap ( imagePath ); } Step 2: Convert Image to Monochrome Thermal printers only support black and white printing, so the image needs to be converted to monochrome. public Bitmap ConvertToMonochrome ( Bitmap original ) { Bitmap mono = new Bitmap ( original . Width , original . Height ); for ( int y = 0 ; y < original . He